Printing machine lamp house



Dec. 8, 1936. R s HQPKINS 2,063,312

PRINTNG MACHINE LAMP HOUSE Original Filed Nov. 2, 1934 J5 INVENTOR.

,u BY

ATTORNEYS Roy s. Hop/rms PATENT oFF-ICE PRINTING MACHINE LAMP HOUSE Roy S. Hopkins, Rochester, N. Y., assigner, by I mesne assignments, to Eastman Kodak Company, Jersey City, N. J., a corporation of New Jersey Original application November 2, 1934, Serial No.

Divided and this application April 2,

1935, Serial No. 14,329

5 claims.

This invention relates to photographic printing machines and particularly to the construction of the optical arrangement by which a light beam is passed to a printing station. One object of my invention is to provide a printing machine with a lamp of high intensity and with means for promptly carrying off the heat generated by the lamp. Another object of my in- Vention is to provide a lamp-house with a suitable chimney for conducting off the heat and for preventing light from passing from the lamp to photographic paper used with the printing machine. Another object of my invention is to provide a lamp-house in which the lamp can be easily replaced and a lamp-house in which the various optical elements can be readily cleaned and adjusted and other objects will Vappear from the following specification, the novel features being particularly pointed out in the claims at the end thereof.

In photographic printing machines in which a series of enlarged prints can be made rapidly from a series of small negatives it is necessary to have an intense and yet diffused light source, in order to obtain satisfactory short exposures. In my copending application Serial No. I151,165, filed November 2, 1934 for Enlarged printer, and which has become Patent No. 2,033,712, dated March 10, 1936, a preferred 'form of printing machine is shown in which the lamp-housawhich is the subject of the present application, is used. This application is a division of the copending application above referred to.

Coming now to the drawing, wherein like reference characters denote like parts throughout:

Fig. 1 is an enlarged fragmentary sectional view through a portion of a printing machine illustrating my improved form of lamp-house.

Fig. 2 is a fragmentary section showing the top of a printing machine and illustrating the location of my lamp-house with regard to the printing machine top.

Fig. 3 is a side elevation of portions of a printing machine shown in my copending application and illustrating the location of the lamp-house, and

Fig. 4 is a view of a mask which may be used to control the light beam from the lamp-house.

In accordance with my invention, the printing machine may be provided with a flat top I, from which a bracketi 2 extends upwardly to support various parts of the projection printer described in full in my copending application Serial No. 751,165. Between the arms of this bracket there is an opening 3 in the table top I through which a lamp chimney 4 projects upwardly a material distance, as is shown in Fig. 3. In front of the bracket 2 an opening 5 is provided in the table top I for supporting a masking plate E which controis the size of the light beam and which is hereinafter referred to as the printing aperture. l

This aperture 1 is of a size Aapproximately the size of the exposure areas on the negative to be printed and it is designed to mask oil the edges of the print so that a clear border may be 0btained on the print.

The printing mask 6, as shown in Fig. 4, is preferably provided with an aperture 8 which can be used for locating the mask relative to 'the printer top I by engaging a pin 9 which is carried by an annular member I0 recessed to receive the masking plate E flush with the printer top I, as best shown in Fig. 1. Theannular member III carries a downwardly extending flange I I, which supports a pair of condenser lenses I2. This ring is attached to a boss I3 formed in the upper wall I4 of the lamp-house designated broadly as I5. At the forward end of the lamphouse there is a slotted member I6 adapted t0 receive a screw I1, on which a wing-nutV IB is mounted, this nut being adapted to hold the lamp-house I5 in the desired position when a fork I9 on the rear wall 20 of the lamp-house has been properly engaged with the screw 2|, which also carries a spacing-nut 22 anda pair of nuts 23 for holding the lamp-house in place.

On the rear wall of a lamp-house there is an arm 24 fastened to the bottom wall 25 and tending to spring in the direction shown by the arrow. A screw 26 opposes this springing movement and may be used for adjusting the reector 21 to and from the lamp 28 and its filament 29. The lamp may be carried by a socket 30 supported on a bottom wall 25 of the lamp-house which is preferably provided with an opening or slot 25' into which air can freely enter.

Directly above the lamp 28 and in the wall I4 of the lamp-house is an opening |21 to receive the lower end of the lamp chimney 4. This chimney preferably is provided with a bead 4' adapted to rest on the edge of the opening |21. Thus, while the lamp is in operation, air may circulate freely through the opening 25' about the lamp 28 and the warm air will be carried off through the chimney 4 at a point spaced a material distance from the printing` aperture 1. This has many advantages, among which are that heat is eliminated from the printing aper ture as far as possible and negatives positioned for printing` will not become so warm that they will blister or buckle. In front of the lamp filament 29 there are a pair of condensor lenses 32 carried oy a suitable support 33. A space is also provided for one or more sheets of ground or opal glass at 34 and 34', since it is preferable to diffuse the light rays so that scratches or other imperfections in the negatives will not be so apparent in the enlargements made therefrom.

After the light passes through the condensor lens 32 and through the diffusing medium, it is Cil Cil

reflected at right angles upwardly through the condenser lenses i2 by means of a mirror 35. The bottom of this mirror is positioned by pins 36 extending in from the side walls I'l of the lamp-house and the top of the mirror l! can be adjusted by means of a screw I8. By turning this screw, the relation `of the mirror to the optical axis of the lamp and condensors is altered.

The mirror 35 is carried by a spring 39 having four arms l engaging the four edges of the mirror. Thus, this spring permits the mirror to move the limited distance necessary to properly adjust the light beam.

With a lamp-house constructed as above described, if a lamp 28 should need to be replaced, it is only necessary to remove the lamp chimney It, unscrew the lamp and place a fresh one lin place. may be necessary toy re-adjust the reector 2l and possibly the mirror 35, although these ad- Justments when once made will ordinarily properly take care of "diierent lamps intended for the same' machine.

If, after use, the various parts of the optical system require cleaning, it is a simple matter to release the wing-nut I8 and slide the fork I9 away from its supporting screwrZl, so that "the lamp-house can be removed as a unit to facilitate cleaning the condensing lenses 32 and i2, the mirror 35 and the opal or ground glass plates 3l and 3l. f

The size of the light beam can be controlled by any of various sizes of negatives to be printed on this particular machine by providing a series of masking plates B with the proper sized openings.`

The masks should all be of the same thickness, so as to lie flush with the table top i and they should be provided with a locating aperture 8, so that the opening in the mask will be properly positioned for use in connection with the movable negative holder shown in my copending application Serial No. 14,330 filed April 2,1935.

I have described a preferred embodiment of my invention, but various changes can be made without departing from it and I consider as withinA house removably mounted beneath the support and comprising an elongated enclosure with a pair of spaced apertures registering with the printing and heat apertures in the support, a lamp mounted beneath the heat aperture, an optical system including a mirror in said housing adapted to reflect light rays through said printing aperture, and releasable means forholding the lamp house in position on the Support.`

2. In a photographic printing machine, the combination with a support having a printing aperture and heat aperture therein, oi.' a unitary and removable lamp house mounted ybeneath the support and comprising an elongated enclosure with a pair of spaced apertures registering with the printing and heat apertures in the support and having slotted end members. a lamp mounted beneath the' heat aperture, and an optical system includinga mirror in said housing adapted to When a lamp has been so positioned, it

aoaasia reflect light rays through said printing aperture and means for removably attaching the lamp house with said Aapertures in registration and including screws carried by the support, and nuts for holding the slotted members on the screws. Y

3. In a photographic printing machine, the combination with a support having a printing aperture and heat aperture therein, of a unitary and removable lamp house mounted beneath the support and comprising an elongated enclosure with a pair of spaced apertures registering with the printing and heat apertures in the support and including slotted end members, an annular flange projecting from the heat apertures and from the printing aperture adapted to cooperate to position the lamp house, means for securing the lamp house to the support including a pair of spaced screws depending from the support adapted to be engaged by the slotted end members, and nuts for holding the slotted bers on the screws.

4. In a photographic printing machine, the combination with a support, of a lamp chimney extending upwardly from said support from one side thereof, a printing aperture spaced from the lamp chimney, a unitary and removable lamphouse adapted to be mounted on an opposite side of said support from thelamp chimney and comprising an elongated box-like housing including a top member slotted at both ends, cooperating elements on the support and lamp house and including an annular -iiange and opening for locating the lamp house relative to the support, a lamp in said lamp house adjacent the chimney end mem- Vopening therein, means' for admitting air in the lamp house adjacent the lamp whereby heat from the lamp may pass up through the chimney, means for reiiecting light rays toward the printing aperture spaced :from the printing lam'p, two lamp house carrying members extending downwardly from the support, one member including spaced projections between which the slotted lamp house may pass, the other including a wing nut'for holding the other slotted end of the lamp house whereby the lamp house may be moved by removing a single wing nut.

5. In a photographic printing machine, the combination with an apertured support, one aperture constituting a heat opening and one aperture constituting a printing aperture, the

' apertures being spaced apart,` of a lamp house adapted to be carried by the support, said lamp house `including an elongated unitary closure` having a top wall slotted at both ends, a lamp in one end thereof mounted beneath the heat opening, an opening adjacent the lampi'or ventilating the lamp house, a partition in 'thelamp house port adapted to be engaged by the slotted ends of the lamp house. at least one of suchmeans including a manually operable member for holding the lamp house on the depending means.

ROY s. HOPKINS. 

